基于分灾模式的钢筋混凝土梁抗弯加固性能评估方法

An Evaluation Method of Flexural Strengthening Performance of Reinforced Concrete Beams Based on Damage-Reduction Mode

摘要:

针对当前钢筋混凝土梁抗弯加固性能评估法未考虑不同建筑结构的抗灾差异，所求得的各项承载力参数不够客观，从而造成评估结果与实际检测结果差异大，评估精度低的问题，提出基于分灾模式的钢筋混凝土梁抗弯加固性能评估方法。计算梁底初始拉应变、梁正截面极限抗弯承载力和钢筋混凝土梁正截面荷载挠度，然后设计分灾模式的钢筋混凝土梁抗弯加固，通过分析载荷与压应变、载荷与挠度以及剪力与位移变化，得到钢筋混凝土梁抗弯加固后各项承载力参数，输入各项梁承载力参数到ANSYS通用程序，利用该程序结合钢筋混凝土梁抗弯加固性能进行评估。通过进行仿真实验，结果表明加入分灾元件的钢筋混凝土梁抗弯加固性能有明显提高。将本文方法评估结果与实验实际评估结果对比可知，提出的评估方法与实际检测结果基本一致，评估精度准确性较高。

Abstract:

The current method of evaluating the flexural strengthening performance of reinforced concrete beams does not consider the difference in the disaster resistance of different buildings; thus, the bearing capacity parameters obtained are not objective enough, and as a result, the evaluation results are different from the actual test results and the evaluation accuracy is low. Considering the above, a method based on damage-reduction mode is proposed for evaluating the flexural strengthening performance of reinforced concrete beams. The initial tensile strain at the bottom of the beam, the ultimate bending capacity of the normal section of the beam, and the load deflection of the normal section of the reinforced concrete beam are calculated, and the flexural strengthening of the reinforced concrete beam is simulated based on the damage-reduction mode. Then the parameters of the bearing capacity of reinforced concrete beams after flexural strengthening are obtained and inputted to general program ANSYS; then, the flexural strengthening performance of reinforced concrete beams is evaluated using the program. The simulation results show that the flexural strengthening performance of reinforced concrete beams with damage-reduction elements is significantly improved. Moreover, the evaluation results of this method are basically consistent with the actual evaluation results from experiment, and the evaluation accuracy is high.